Flue-cutter.



GEORGE l/V. MITCHELL AND THOMAS BROADFOOT, OF VIOHITA, KANSAS.

FLUE-CUTTER.

Specification of Letters Patent.

latenteoi July 17, 1906.

Application iled January 17, 1906. Serial No. 296.534.

T0 all whom it Wha/y concern:

Be it known that we, GEORGE W. MITCHELL and THOMAS BEoADFooT, citizens of the United States, residing at Wichita, in the county of Sedgwick and State of Kansas, have invented new and useful Improvements in Flue-Cutters, of which the following is a specification.

This invention relates to flue-cutters, and has for its object to provide a simple, effective, and reliable flue-cutter so constructed and provided with a cutting-bit that the implement as a whole may be operated in either direction, or, in other words, turned from right to left or from left to right, the bit being double-ended and self-reversing.

Afurther object of the invention is to combine with the stock of the flue-cutter a gagecollar which is adjustable on the stock and also flanged, adapting the same to embrace the end of a tube or flue and bear evenly against the flue or tube-sheet.

With the above and otherobjects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination, and arrangement of parts, as hereinafter fully described, illustrated, and claimed.

In the accompanying drawings, Figure 1 is a plan view of a flue-cutter embodying the present invention. Fig. 2 is a cross-section 'through the same, taken in line with the bit.

Fig. 3 is a longitudinal section through the flue-cutter, taken in line with the bit-holding Like reference-numerals designate corresponding parts in all the figures of the drawglhe flue-cutter contemplated in this invention comprises a bit or stock, one end of which is smooth and cylindrical, as at 1, and the opposite end portion of which is threaded, as shown at 2, the extremity of the portion 2 being squared, as shown at 3, to receive a suitable operating-crank or its equivalent, whereby rotary motion may be imparted to the flue-cutter in either direction. The implement may of course be driven by a suitable motor instead of by hand.

At a suitable point the part 1 of the stock is provided with a pocket or recess 4, formed in one side thereof and extending transversely of the stock, as clearly shown in the drawings, said pocket or recess having a substantially ilat floor or bottom 5. Mounted in said pocket or recess is an oblong doublepointed bit 6. This bit is centrally journaled and pivoted on a bit-holding pin 7, which is inserted in an opening 8, extending longitudinally inward lfrom the inner end of the stock 1, as shown in Fig. 3. At is outer end the pin '7 is provided with a wrench-engaging head 9, and just behind the head the pin is enlarged and threaded, as shown at 10, to engage a correspondingly-threaded portion of tllie hole 8, whereby the pin is retained in p ace. j

The bit is allowed a limited amount of oscillatory movement on the pin 7, so as to bring one of the pointed 'ends thereof into cutting engagement with the inner surface of the flue, according to the direction in which the stock of the implement is rotated, and said bit is so rounded or curved on its opposite edges and otherwise shaped and proportioned that one or the other point of the bit will engage and cut into the inner surface of the iue or pipe irrespective of the direction in which the flue-cutter is rotated.

Surrounding the stock and threaded thereon is a gage-collar 11, which when adjusted to the proper point on the stock is fastened and securely held by means of a jam-nut 12.

The collar 11 is circumferentially enlarged,

as shown at 13, and provided with an 1nwardly-projecting bearing-flan e 14, which is adapted to embrace the head o a tube or iiue which projects beyond or outside of the fluesheet and bear rmly against the ilue-sheet for giving the implement as a whole a i'irm and even bearing during its rotation, causing the cutting-bit to follow a true and accurate line in the cutting operation. The inner edge of the flange 14 is notched or cut away, as shown at 15, to provide clearance for the cuttings which escape from the end of the flue during the cutting operation.

lf desired, the stock 1 may be provided with the conical seat or shoulder 16, adapted to bear within the open end of the tube or Hue to assist in centering the 'Hue-cutter preparatory to and during the cutting operation.

Having thus described the invention, we claim- 1. A flue-cutter embodying a stock having a recess extending transversely across one side thereof, and a double-ended, self-revers ing bit pivotally mounted in said recess, substantially as described.

2. A lue-cutter embodying a rotatable stock provided with a recess extending trans- IOO versely across one side thereof and provided with a substantially ilat floor and a doubleended, self reversin cutting bit having rounded opposite surfaces, one of which lies i adjacent to the floor of the recess, said bit being centrally pivoted and adapted to oscillate Within said pocket or recess.

3. A flue cutter embodying a rotatable stock, a self-reversing cutting-bit mounted in a pocket or recess in one side of the stock, and a gage-collar adjustably mounted on the stock and provided with an inwardly-projecting bearing-flange provided in its bearing edge with clearance notches or spaces7 substantially as described.

tures in presence of tWo Witnesses.

GEORGE W. MITCHELL. THOMAS BROADFOOT. Witnesses L. M. ANDREWS, G. E. BAGLEY.

In testimony whereof We aiiX our signa- 

